Question

What is the assumption needed to begin an indirect proof of the following statement?

“Cows do not have horns.”

Bulls do not have horns.

Bulls have horns.

Cows do not have horns.

Cows have horns.

Answer 1

cows have horns

Answer 2

Cows have horns.

I think because the first statements has to contradict the given.

Answer 3

Indeed. An indirect proof starts off by assuming that the opposite of what you are given is true. Then by having a contradiction in the proof later on, you can say that the original statement is true.

Answer 4

thank you idk what it was and i honestly did try before putting them up im doin it for the 3 third time